Lukas Puehringer 3e249f5bdd Make Metadata a container class (WIP) ... This commit performs restructuring on the recently added metadata class model architecture, which shall be part of a new simple TUF API. The key change is that the Metadata class is now used as container for inner TUF metadata (Root, Timestamp, Snapshot, Targets) instead of serving as base class for these, that means we use 'composition' instead of 'inheritance'. Still, in order to aggregate common attributes of the inner Metadata (expires, version, spec_version), we use a new baseclass 'Signed', which also corresponds to the signed field of the outer metadata container. Based on prior observations in TUF's sister project in-toto, this architecture seems to more closely represent the metadata model as it is defined in the specification (see in-toto/in-toto#98 and in-toto/in-toto#142 for related discussions). Note that the proposed changes require us to now access some attributes/methods via the signed attribute of a Metadata object and not directly on the Metadata object, but it would be possible to add short-cuts. (see todo notes in doc header). Further changes include: - Add minimal doc header with TODO notes - Make attributes that correspond to fields in TUF JSON metadata public again. There doesn't seem to be a good reason to protect them with leading underscores and use setters/getters instead, it just adds more code. - Generally try to reduce code. - Remove keyring and consistent_snapshot attributes from metadata class. As discussed in #1060 they are a better fit for extra management code (also see #660) - Remove sslib schema checks (see TODO notes about validation in doc header) - Drop usage of build_dict_conforming_to_schema, it seems a lot simpler and more explicit to just code this here. - ... same goes for make_metadata_fileinfo - Adapt tests accordingly TODO: Document!!! Signed-off-by: Lukas Puehringer <lukas.puehringer@nyu.edu>		2020-07-10 16:05:53 +02:00
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keys.py	Quick-fix programming errors in api.keys module	2020-07-10 15:26:08 +02:00
metadata.py	Make Metadata a container class (WIP)	2020-07-10 16:05:53 +02:00